PLCDCS220MP
OWNER’S MANUAL
Mobile Audio System
• PLL Synthesizer Stereo Radio
• Car CD/MP3/WMA Player
• Cassette Player
• Automatic Memory Storing
• Preset Equalization
• Undetachable Panel
• Auxiliary Input Function
• Remote Control
Download from Www.Somanuals.com. All Manuals Search And Download.
INSTALLATION
Method A
SUB PANEL
FLANGE NUT
QUICKIE BOLT
REAR BUSHING
FACTORY
BRACKET
MOUNTING
SCREW
QUICKIE BOLT
DASH PANEL
Method B
SUB PANEL
QUICKIE BOLT
FLANGE NUT
MOUNTING
SCREW
2#BRACKET
DASH PANEL
MOUNTING
SCREW
2#BRACKET
2#BRACKET
3#BRACKET
1#BRACKET
2#BRACKET
2#BRACKET
“JZ” MOUNTING CONFIGURATION
STANDARD MOUNTING CONFIGURATION
“JA” MOUNTING CONFIGURATION
3
Download from Www.Somanuals.com. All Manuals Search And Download.
WIRING CONNECTION
For 4 x 40W/ 4 x 45W/ 4 x 50W System
MAIN UNIT
ANTENNA SOCKET
FUSE
(BLACK)
(GREY)
IGNITION
SWITCH
(ACC+)
RED
Rch RED
AUX IN
Lch WHITE
YELLOW
BLACK
BLUE
MEMORY
BACK-UP (B+)
Rch RED
RCA CABLE
GROUND (B–)
Lch WHITE
POWER
ANTENNA
GREY
WHITE
FRONT Lch
SPEAKER
FRONT Rch
SPEAKER
GREY/BLACK
WHITE/BLACK
GREEN
VIOLET
REAR Lch
SPEAKER
REAR Rch
SPEAKER
GREEN/BLACK
VIOLET/BLACK
4
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
LOCATION OF KEYS
12
9
10
27
8
3 15 7
1
6
2
16 13 17 19 20 21 18 22
23 11 14
4
5
28
24
26
25
5
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
Note: In this product design, there has
different sound accompanying with every
button pressed and the sound is designed
differently according to the customers.
• SET THE CLOCK
Press the DSP button (15), the clock is
shown on the LCD display. Then hold
down the button until the clock flashes.
Then press the TUNE/TRACK/SKIP
button (17) to change hours or
TUNE/TRACK/SKIP button (16) to
change minutes.
• SWITCHING ON/OFF THE UNIT
Switch on the unit by pressing any
button (except OPEN button (7)).
When system is on, press POWER
button (9) to turn off the unit.
• MUTE
Press MUTE button (2) to mute down
the sound instantly. If any button is
pressed in the mute state, the mute
state is released.
• OPEN THE FRONT PANEL
Press OPEN button (7) to fold down
the front panel.
• SOUND ADJUSTMENT
• EQUALIZATION
Press PUSH SELECT button (10)
shortly to select the desired adjustment
mode. The adjustment mode will
change in the following order:
Press EQ button (12) to turn on
equalization function and to select
desired audio mode. There are five
kinds of mode as below:
VOL
BAS
TRE
BAL
FAD
(Fader)
FLAT
CLASSICS
POP M
ROCK M DSP OFF
(Volume)
(Bass)
(Treble)
(Balance)
By rotating the knob (10) clockwise or
counter-clockwise, it is possible to
adjust the desired sound quality.
• LIQUID CRYSTAL DISPLAY
Exhibit current frequency and activated
functions on the display (27).
Press and hold PUSH SELECT button
(10) for several seconds to enter into
the selection for the situation of beep
sound, then rotate the knob (10)
clockwise or counter-clockwise to
select as follows:
• REMOTE SENSOR
Point the remote control handset to
the remote sensor IR (23). Press the
function keys on the handset to control
the system.
BEEP 2ND
BEEP ALL
BEEP OFF
• ESP FUNCTION
If the unit has the electronic
shockproof function, it can be
shockproof about several tens of
seconds.
- BEEP 2’nd mode:
The beep is only generated when all
allowed double function button is
pressed long (several seconds).
e.g.
• AUXILIARY INPUT
The unit can be connected to a
portable audio player through the AUX
IN jack (11).
When preset button (18) is pressed.
When BAND/LOUD (ENTER) button
(13) is pressed.
• RESET
When AMS/D-AUD button (14) is
pressed.
RESET button (28) must be activated
with either a ball point pen or thin metal
object. The RESET button (28) is to
be activated for the following reasons:
- Initial installation of the unit when all
wiring is completed.
- BEEP ALL mode:
The beep is generated when every
button is pressed.
- BEEP OFF mode:
The beep is disabled.
-
All the function buttons do not operate.
- Error symbol on the display.
• LOUDNESS
Press the BAND/LOUD (ENTER)
button (13) for several seconds to
reinforce the bass output. Press it for
several seconds again to release this
function.
6
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
• STATION STORING
RADIO OPERATION
Press any one of the preset buttons
(18) (1 to 6) to select a station which
had been stored in the memory.
Press this button for several seconds
(until 2ND beeps come out), current
station is stored into the number
button.
• SWITCHING TO RADIO MODE
Press MODE button (6) shortly to
select radio mode, the radio mode
appears in the display together with
the memory band and frequency.
• SELECTING THE FREQUENCY
BAND
• MONO/STEREO
At radio mode, press BAND/LOUD
(ENTER) button (13) shortly to select
the desired band.
Press MO/ST button (8) to select
mono or stereo mode. You can
sometimes improve reception of
distant stations by selecting mono
operation.
The reception band will change in the
following order:
FM1
FM2
FM3
AM
• SCAN
Press SCAN button (3) to set the
function to scan mode, which
scanning to higher frequency station
with receivable signal and keep on
each station for several seconds.
• SELECTING STATION
Press TUNE/TRACK/SKIP button
(17) or TUNE/TRACK/SKIP button
(16) shortly to activate automatic seek
function. Press for several seconds
until “MANUAL” appears on the
display, the manual tuning mode is
selected. If both buttons have not
been pressed for several seconds, they
will return to seek tuning mode and
“AUTO” appears on the display.
CASSETTE OPERATION
• SWITCHING TO TAPE MODE
If there is no tape inserted in the
cassette compartment:
Press OPEN button (7) to fold down
the front panel and show the cassette
compartment (26). Then insert the
tape into the compartment. The
cassette mechanism will load it in play
mode.
If a tape is already inserted in the
cassette compartment:
Keep pressing MODE button (6) shortly
until the tape mode display appears.
• LOCAL/DISTANT
Press LOC button (1) to select
between local and distant stations.
Local setting for reception of strong
station, and a distant setting for
reception of weaker stations. This
function is effect during AUTO SEEK
operation.
• AUTOMATIC MEMORY
• PROGRAM BUTTON
STORING & PROGRAM SCANNING
- Automatic Memory Storing
These two buttons (25) perform the
dual functions of changing the
direction of tape playback and fast
forward/rewind of the tape.
Press AMS/D-AUD button (14) for
several seconds, the radio searches
from the current frequency and
checks the signal strength until one
cycle search is finished. And then 6
strongest stations are stored into the
corresponding preset number button.
- Program Scanning
Press AMS/D-AUD button (14)
shortly to scan preset station. When
the field strength level is more than
the threshold level of stop level, the
radio is holding at that preset number
for several seconds with release
mute, then searches again.
- Change Tape Playback Direction
Press both buttons together to play
the other side of a tape.
- Fast Forward/Rewind
Press the button with the double
arrows pointing the same direction
as the direction indicator in the LCD
to fast forward; press other button in
the opposite direction to fast rewind.
• EJECT
When the front panel is folded down,
push the eject ( ) button (24) down to
eject the cassette tape.
7
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
CD OPERATION
• SWITCHING TO CD MODE
If there is no CD inserted in the driver:
Gently insert the CD with the printed
side uppermost into the CD slot (5)
until you feel some resistance. The CD
is drawn into the driver automatically.
CD playback begins.
If a CD is already inserted in the driver:
Keep pressing MODE button (6) shortly
until the CD mode display appears.
• SELECTING TRACKS
Press TUNE/TRACK/SKIP button
(16) or TUNE/TRACK/SKIP button
(17) to move to the previous track or
the following track. Track number
shows on display.
Hold TUNE/TRACK/SKIP button
(16) or TUNE/TRACK/SKIP button
(17) to fast reverse or fast forward. CD
play starts from when you release the
button.
• PAUSING PLAYING
Press PAU button (19) to pause CD
player. Press it again to resume play.
• PREVIEWING ALL TRACKS
Press SCN button (20) to play first
several seconds of each track on the
current disc. Press again to stop intro
and listen to track.
• REPEATING THE SAME TRACK
Press RPT button (21) to continuously
repeat the same track. Press it again
to stop repeat.
• PLAYING ALL TRACKS IN RANDOM
Press SHF button (22) to play all tracks
on CD in random order. Press again
to cancel the function.
• EJECTING A DISC
When the front panel is folded down,
press the eject button (4) to eject rhe
disc from the disc slot (5).
8
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
When pressed, it is activated as
selecting each mode of Digital Audio.
“Searching track directly” =>
“Searching Directory or File Name”=>
“Navigation” from root by
TUNE/TRACK/SKIP UP/DOWN
buttons=> “Navigation” from current
directory by TUNE/TRACK/SKIP
UP/DOWN buttons.
MP3 OPERATION
• SWITCHING TO CD (MP3) MODE
If there is no MP3 disc inserted in the
driver:
Gently insert the MP3 disc with the
printed side uppermost into the disc
slot (5) until you feel some resistance.
The MP3 disc is drawn into the driver
automatically. The MP3 playback
begins.
Searching Track Directly
Press AMS (D-AUD) button for one
time. It enters into “Searching track
directly” in Digital Audio CD.
The unit searches the track selected
by following direct numeric buttons:
M1-M6, MODE (7),
TUNE/TRACK/SKIP DOWN (8),
TUNE/TRACK/SKIP UP (9), DSP(0).
If selected three digits, the unit
searches the track at once. If selected
one or two digits, the unit wait for
BAND/LOUD (ENTER) button for
seconds. The unit searches the track
after few seconds, even if the enter
button is not pressed.
If a MP3 disc is already inserted in the
driver:
Keep pressing MODE button (6) shortly
until the CD (MP3) mode display
appears.
• EJECTING A DISC
When the front panel is folded down,
press the eject button (4) to eject the
disc from the disc slot (5).
• SELECTING TRACKS IN SINGLE
STEP
Press TUNE/TRACK/SKIP button
(16) or TUNE/TRACK/SKIP button
(17) to move to the previous track or
the following track. Track number
shows on display.
Searching Directory or File Name
Press AMS (D-AUD) button for two
times. It enters into “Searching
Directory or File Name” in Digital Audio
CD.
• PAUSING PLAYING
Press PAU button (19) to pause MP3
player. Press it again to resume play.
The unit searches files and directories
that have the same character which is
inputted by the user pressing the
corresponding buttons listed on the
Table 1 below.
• PREVIEWING ALL TRACKS
Press SCN button (20) to play first
several seconds of each track on the
current disc. Press again to stop intro
and listen to track.
Explain as follows:
- Use the corresponding buttons to
select the characters A to Z, blank,
0 to 9, _, -, +.
- Press PUSH SELECT button to
confirm entry of each characters.
- Press BAND/LOUD (ENTER) button
to start the title search.
In case the selected title is a
directory name, display will show (‘ ‘),
then
- Use the TUNE/TRACK/SKIP
UP/DOWN buttons to list all songs
under this directory and select the
title.
• REPEATING THE SAME TRACK
Press RPT button (21) to continuously
repeat the same track. Press it again
to stop repeat.
• PLAYING ALL TRACKS IN RANDOM
Press SHF button (22) to play all tracks
on MP3 disc in random order. Press
again to cancel the function.
• SELECTING TRACKS BY AMS/D-
AUD BUTTON
AMS button is assigned as Digital
Audio Mode selection button in MP3
operation.
9
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
- Press BAND/LOUD (ENTER) button
to confirm and start the play.
- Repeat the above steps if the newly
selected title is again a directory.
• DISPLAY INFORMATION
Press DSP button (15) to show
following information, such as the
clock, ID3 TAG (if available: song title,
directory name, artist name, other
contents…) and other information.
Searching From Root Directory
Press AMS (D-AUD) button for three
times. The unit searches file or
directory from root by
TUNE/TRACK/SKIP UP/DOWN
buttons. (D-DIR icon turns on if the
name is directory). Display will list all
available directories and songs. Select
the desired directory/songs by using
TUNE/TRACK/SKIP UP/DOWN
buttons and BAND/LOUD (ENTER)
button to confirm. If the selected title
is a song, it starts to play.
If the selected title is a directory name,
display will show (‘ ‘), then
- Use the TUNE/TRACK/SKIP
UP/DOWN buttons to list all songs
under this directory and select the
title.
KEY Assigned IN Searching mode (Table 1)
AMS
Mode Select
ENTER
BAND/LOUD
M1
M2
M3
M4
M5
A, B, C, 1
D, E, F, 2
G, H, I, 3
J, K, L, 4
M, N, O, 5/
Directory DOWN
M6
P, Q, R, 6/
Directory UP
- Press BAND/LOUD (ENTER) button
to confirm and start the play.
- Repeat the above steps if the newly
selected title is again a directory.
MODE
S, T, U, 7
V, W, X, 8
TUNE/TARCK/SKIP
DOWN
Searching From Current Directory
Press AMS (D-AUD) button for four
times. The unit searches file or
TUNE/TARCK/SKIP
UP
Y, Z, SPACE, 9
PUSH SELECT
CHARACTER
SHIFT RIGHT
directory from current directory by
TUNE/TRACK/SKIP UP/DOWN
buttons. (D-DIR icon turns on if the
name is directory). The current
directory name is displayed for a
second and the currently playing file
name is displayed (selected). The user
can select the directory or file in the
directory by TUNE/TRACK/SKIP
UP/DOWN buttons. The selected file
can be played by pressing
DSP
_, –, +, 0
AUDIO ADJUST CHARACTER SELECT
KNOB (A, B - 8, 9, 0)
AUDIO ADJUST KNOB (ENCODER) &
TUNE/TRACK/SKIP UP/DOWN buttons:
Searching file and directory during
Navigation.
BAND/LOUD (ENTER) button.
“MP3” icon turns on when MP3 disc is played
and blinks when it is in navigation mode.
10
Download from Www.Somanuals.com. All Manuals Search And Download.
OPERATION
DISC NOTE
WMA OPERATION
The unit that can play the WMA disc and
the operation is the same with MP3
operation described above.
A. Notes on discs:
1.Attempting to use non-standard shape
discs (e.g. square, start, heart) may
damage the unit. Be sure to use round
shape CD discs only for this unit.
2.Do not stick paper or tape etc., onto
the label side or the recording side of
any discs, as it may cause a
malfunction.
AUDIO DSP (MP3/WMA DECODER)
The audio DSP converts MP3/WMA
stream data from the CD-ROM decoder
to PCM data.
The following standards and bit rate are
supported.
3.Dirt, dust, scratches and warping discs
will cause misoperation.
Standard
Bit Rate (kbps) Supported Mode
MPEG1 Audio 320,256,224,
STEREO
JOINT STEREO
B. Notes on CD-Rs (recordable
CDs)/CD-RWs (rewritable CDs):
1.Be sure to use discs with following
marks only for the unit to play:
LAYER3
(48kHz/
44.1kHz/
32kHz)
192,160,128,
112,96,80,64, DUAL CHANNEL
56,48,40,32
SINGLE CHANNEL
MPEG2 Audio 160,144,128,
STEREO
LSF LAYER3 112,96,80,64, JOINT STEREO
(24kHz/
22.05kHz/
16kHz)
56,48,40,32,
24,16,8
DUAL CHANNEL
SINGLE CHANNEL
Recordable
Rewritable
2.The unit cannot play a CD-R and
CD-RW that is not finalized.
(Please refer to the manual of your
CD-R/CD-RW recorder or CD-R/
CD-RW software for more information
on finalization process).
3.Depending on the recording status,
conditions of the disc and the
equipment used for the recording,
some CD-Rs/CD-RWs may not be
played on this unit. (See *1)
*1: To have more reliable play back,
please see following
Windows
Media Audio
(32kHz)
48
STEREO
Windows
Media Audio
(44.1kHz)
48
SINGLE CHANNEL
STEREO
Windows
Media Audio 160,128,96,
(44.1kHz)
320,256,192,
80,64,48
Windows
Media Audio
(48kHz)
192,160,128
STEREO
The audio DSP automatically identifies
the supported bit rate and mode, and
sampling frequency. MP3 and WMA must
be identified by the microcontroller.
recommendations:
a.Use CD-RWs with speed 1x to 4x
and write with speed 1x to 2x.
b.Use CD-Rs with speed 1x to 8x and
write with speed 1x to 2x.
c.Do not play a CD-RW which has
been written for more than 5 times.
CAUTION: VBR of WMA can be played
back if the bit rate is 48 kbps or higher.
If a bit rate of less than 48 kbps exists in
a stream, that stream cannot be correctly
played back.
C. Notes on MP3 files (MP3 Version
Only):
1.The disc must be in the ISO9660 level
1 or level 2 format, or Joliet or Romeo
in the expansion format.
2.When naming a MP3 file, be sure the
file name extension is “.MP3”.
3.For a non-MP3 file, even though the
file name extension is “.MP3”, the unit
cannot recognize it.
You are suggested to play the WMA
stream data with the sampling frequency
of 44.1kHz and the bit rate over 128kbps,
then you can get better effect.
11
Download from Www.Somanuals.com. All Manuals Search And Download.
REMOTE CONTROL HANDSET
1
7
4
3
8
6
9
5
2
13
12
10
14
11
15
FUNCTION KEYS & CONTROL
1.
PWR
=
=
=
Power ON/OFF Button
2. DSP (0)
3. SEL
Display Button (_, –, +, 0 For MP3/WMA Operation )
Sound Mode Select Button (Character Shift Right For
MP3/WMA Operation )
4. VOL
=
=
=
Volume Up Button [Character Select (A, B ~ 8, 9, 0) For
MP3/WMA Operation]
Volume Down Button [Character Select (A, B ~ 8, 9, 0) For
MP3/WMA Operation]
Band Select Button (When pressed shortly)
Loudness Button (When pressed long)
5. VOL
6. BND (LOU/ENT)
(Enter Button For MP3/WMA Operation)
Mode Button (S, T, U, 7 For MP3/WMA Operation)
Tune/Skip Down Button; Select Channel Down in XM Mode
(V, W, X, 8 For MP3/WMA Operation)
7. MOD (7)
=
=
(8)
8. TUNE/SEEK
9. TUNE/SEEK
10. AS/PS (D-AUD)
(9) = Tune/Skip Up Button; Select Channel Up in XM Mode (Y,
Z, SPACE, 9 For MP3/WMA Operation)
=
Automatic Memory Storing & Program Scanning Button
(Mode Select Button For MP3/WMA Operation)
Preset Buttons (A~R, 1~6 For MP3/WMA Operation)
Pause Button (A, B, C, 1 For MP3/WMA Operation)
Scanning Button (D, E, F, 2 For MP3/WMA Operation)
Repeat Button (G, H, I, 3 For MP3/WMA Operation)
Shuffle Button (J, K, L, 4 For MP3/WMA Operation)
11. M1 - M6
12. PAU
13. SCN
14. RPT
=
=
=
=
=
15. SHF
12
Download from Www.Somanuals.com. All Manuals Search And Download.
SPECIFICATIONS
GENERAL
Power Supply Voltage
Chassis Dimensions
Loading Impedance
Maximum Output Power
Current Drain
: 12 Volts DC, Negative Ground
: 200 mm (W) x 138 mm (D) x 100 mm (H)
: 4 - 8 Ω per channel
: 4 x 50 Watts
- Version Y/Y1/Y2
: 15 Ampere (max.)
CD PLAYER
Signal to Noise Ratio
Channel Separation
Frequency Response
: More than 55 dB
: More than 50 dB
: 20 Hz - 20 KHz
CASSETTE PLAYER
Tape Speed
Fast Forward Time
Frequency Response
Channel Separation
Crosstalk
: 4.76 cm/sec
: 180 seconds (C-60 type)
: 50 to 8,000 Hz
: > 35 dB
: > 40 dB
Wow and Flutter
: ≤ 0.35% WRMS
RADIO
FM
Frequency Coverage
I.F.
Sensitivity (S/N = 30 dB)
Image Rejection
Stereo Separation
: 87.5 to 108 MHz
: 10.7 MHz
: 3 µV
: > 45 dB
: > 30 dB
AM
Frequency Coverage
I.F.
Sensitivity (S/N = 20 dB)
: 530 to 1710 KHz
: 10.71 MHz
: 32 dBu
13
Download from Www.Somanuals.com. All Manuals Search And Download.
TROUBLE SHOOTING
Before going through the check list, check wiring connection. If any of the problems
persist after check list has been made, consult your nearest service dealer.
Symptom
Cause
Solution
No power.
The car ignition switch is
not on.
If the power supply is
connected to the car accessory
circuits, but the engine is not moving,
switch the ignition key to “ACC”.
The fuse is blown.
Replace the fuse.
Disc cannot
be loaded or
ejected.
Presence of CD disc inside Remove the disc in the player, then
the player.
put a new one.
Inserting the disc in
reverse direction.
Insert the compact disc with the
label facing upward.
Compact disc is extremely Clean the disc or try to play a new
dirty or defective disc. one.
Temperature inside the car Cool off or until the ambient
is too high.
temperature return to normal.
Condensation.
Leave the player off for an hour or
so, then try again.
Cassette tape Presence of a cassette
Remove the cassette tape in the
player, then put in the new one.
cannot be
loaded or
ejected.
tape in the player.
The temperature in the car Cool off the inside of the car, then try
is too high.
again.
Condensation.
Leave the cassette player off for an
hour or so, then try again.
No sound.
Volume is in minimum.
Adjust volume to a desired level.
Wiring is not properly connected. Check wiring connection.
Sound skips
or sound
quality is poor.
The installation angle is
more than 30 degrees.
Adjust the installation angle to less
than 30 degrees.
The disc is extremely dirty Clean the compact disc, then try to
or defective disc.
play a new one.
The cassette is defective.
Try another cassette.
The operation The built-in microcomputer Press the RESET button.
keys do not
work.
is not operating properly
due to noise.
Front panel is not properly fixed into
its place.
The radio does The antenna cable is not
not work. The connected.
radio station
Insert the antenna cable firmly.
automatic
The signals are too weak.
Select a station manually.
selection does
not work.
14
Download from Www.Somanuals.com. All Manuals Search And Download.
MAINTENANCE
3. Clean the tape head with the cotton
swab.
For System
The following suggestions help you care
for the product so that you can enjoy it
for years.
1. Keep the product dry. If it does get
wet, wipe it dry immediately.
Liquids might contain minerals that
can corrode the electronic circuits.
4. Clean the capstans and the pinch
rollers with the cotton swab.
2. Keep the product away from dust and
dirt, which can cause premature wear
of parts.
5. Allow the tape head, capstans and
pinch rollers to dry before operating.
3. Handle the product gently and
carefully. Dropping it can damage
circuit boards and cases, and can
cause the product to work improperly.
6. Do not touch the tape with your
fingers; if it becomes lose, wind it
back by twisting a six-sided pencil in
the cassette reel.
4. Wipe the product with a dampened
cloth occasionally to keep it looking
new. Do not use harsh chemicals,
cleaning solvents, or strong
detergents to clean the product.
5. Use and store the product only in
normal temperature environments.
High temperature can shorten the life
of electronic devices, damage
batteries, and distort or melt plastic
parts.
For Tape Player
Periodic cleaning of the tape head and
capstan shaft will ensure good
reproduction of music and trouble-free
operation. Cleaning of the tape head
should be done every 20 to 30 hours of
operation or when the high tones have
become less clear.
1. Use a cassette cleaning cartridge if
available. If one is not available, use
a cotton swab soaked in isopropyl
(rubbing) alcohol.
2. While holding the tape door open,
locate tape head to the right of the
opening and in the centre of the unit.
15
Download from Www.Somanuals.com. All Manuals Search And Download.
IGNITION AND INTERFERENCE NOISE
IGNITION
INTERFERENCE
The most common source of noise in
reception is the ignition system. This is
normally due to the fact that radio is
placed relatively close to the ignition
system (engine). This type of noise can
be easily detected because it will vary in
intensity of pitch with the speed of the
engine.
Radio reception in a moving environment
(automobile) is very different from
reception in a stationary (home). It is
very important to understand the
difference.
AM reception will deteriorate when
passing through a tunnel or when
passing under high voltage lines. Also,
noise can be picked up from passing
automobiles. Although AM is subject to
environmental noise, it has the ability to
be received at great distance.
This is due to the fact that broadcasting
signals follow the curvature of the earth
and are reflected back by the upper
atmosphere.
Usually, the ignition noise can be
suppressed considerably by using a
radio suppression type high voltage
ignition wire and suppressor resistor in
the ignition system. (Most vehicles
employ this wire and resistor but it may
be necessary to check them for correct
operation.) Another method of
suppression is the use of additional noise
suppressors. These can be obtained
from most CB/Amateur radio or
FM reception is just the opposite of AM.
It is not subject to environmental noise
and it does not have the ability to be
received at great distances (usually 30
miles). Also, the FM signal can be
blocked by tall buildings, mountains, or
hills.
electronic supply shops.
To reduce the possibility of these
problems, ALWAYS FINE TUNE a station,
and if possible, set the antenna height to
30 inches.
88-C1480-07
16
Download from Www.Somanuals.com. All Manuals Search And Download.
|